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ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS) (Tables) | 6 Months Ended
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Jun. 30, 2022
ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS). |
Activity in Accumulated Other Comprehensive Income (Loss), Net of Tax | Activity in accumulated other comprehensive income (loss), net of tax, was as follows:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ |  | ​ | ​ |  | ​ | ​ |  | Total
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Accumulated
​ | ​ | ​ | ​ | Defined | ​ | ​ | ​ | ​ | Other
​ | ​ | ​ | ​ | Benefit | ​ | ​ | ​ | ​ | Comprehensive
(In thousands) |  | Securities |  | Plans |  | Derivatives |  | Income (Loss)
Balance as of January 1, 2022 | ​ | $ | (7,864) | ​ | $ | (1,306) | ​ | $ | 2,989 | ​ | $ | (6,181)
Other comprehensive (loss) income before reclassifications | ​ |  | (70,803) | ​ |  | 1,368 | ​ |  | 6,279 | ​ |  | (63,156)
Amounts reclassified from accumulated other comprehensive loss | ​ |  | 685 | ​ |  | (1,282) | ​ |  | (16) | ​ |  | (613)
Net other comprehensive (loss) income during the period | ​ |  | (70,118) | ​ |  | 86 | ​ |  | 6,263 | ​ |  | (63,769)
Balance as of June 30, 2022 | ​ | $ | (77,982) | ​ | $ | (1,220) | ​ | $ | 9,252 | ​ | $ | (69,950)
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance as of January 1, 2021 | ​ | $ | 12,694 | ​ | $ | (6,086) | ​ | $ | (12,532) | ​ | $ | (5,924)
Other comprehensive (loss) income before reclassifications | ​ |  | (4,451) | ​ |  | 2,061 | ​ |  | 13,700 | ​ |  | 11,310
Amounts reclassified from accumulated other comprehensive loss | ​ |  | (812) | ​ |  | (579) | ​ |  | 581 | ​ |  | (810)
Net other comprehensive (loss) income during the period | ​ |  | (5,263) | ​ |  | 1,482 | ​ |  | 14,281 | ​ |  | 10,500
Balance as of June 30, 2021 | ​ | $ | 7,431 | ​ | $ | (4,604) | ​ | $ | 1,749 | ​ | $ | 4,576
Other Comprehensive Income (Loss) | The before and after tax amounts allocated to each component of other comprehensive income (loss) are presented in the table below for the periods indicated.
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended | ​
​ | ​ | June 30, | ​ | June 30, | ​
(In thousands) |  | 2022 |  | 2021 | ​ | 2022 |  | 2021 | ​
Change in unrealized gain (loss) on securities: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ | $ | (33,157) | ​ | $ | 8,966 | ​ | $ | (103,288) | ​ | $ | (6,568) | ​
Reclassification adjustment for net gains included in net gain on sale of securities and other assets | ​ |  | — | ​ |  | (20) | ​ |  | — | ​ |  | (1,207) | ​
Accretion of net unrealized loss on securities transferred to held-to-maturity | ​ | ​ | 829 | ​ |  | — | ​ | ​ | 999 | ​ | ​ | — | ​
Net change | ​ |  | (32,328) | ​ |  | 8,946 | ​ |  | (102,289) | ​ |  | (7,775) | ​
Tax (benefit) expense | ​ |  | (10,169) | ​ |  | 2,817 | ​ |  | (32,171) | ​ |  | (2,512) | ​
Net change in unrealized gain (loss) on securities, net of reclassification adjustments and tax | ​ |  | (22,159) | ​ |  | 6,129 | ​ |  | (70,118) | ​ |  | (5,263) | ​
Change in pension and other postretirement obligations: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Reclassification adjustment for expense included in other expense | ​ |  | (936) | ​ |  | (438) | ​ |  | (1,870) | ​ |  | (860) | ​
Reclassification adjustment for curtailment loss | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 1,543 | ​
Change in the net actuarial gain | ​ |  | 998 | ​ |  | 644 | ​ |  | 1,995 | ​ |  | 1,529 | ​
Net change | ​ |  | 62 | ​ | ​ | 206 | ​ |  | 125 | ​ |  | 2,212 | ​
Tax expense | ​ |  | 18 | ​ |  | 95 | ​ |  | 39 | ​ |  | 730 | ​
Net change in pension and other postretirement obligations | ​ |  | 44 | ​ |  | 111 | ​ |  | 86 | ​ |  | 1,482 | ​
Change in unrealized gain (loss) on derivatives: | ​ |  |  | ​ |  |  | ​ |  |  | ​ |  |  | ​
Change in net unrealized gain (loss) during the period | ​ |  | 2,309 | ​ |  | (1,406) | ​ |  | 9,161 | ​ |  | 3,542 | ​
Reclassification adjustment for loss included in loss on termination of derivatives | ​ | ​ | — | ​ | ​ | — | ​ | ​ | — | ​ | ​ | 16,505 | ​
Reclassification adjustment for expense included in interest expense | ​ |  | (54) | ​ |  | 10 | ​ |  | (23) | ​ |  | 864 | ​
Net change | ​ |  | 2,255 | ​ |  | (1,396) | ​ |  | 9,138 | ​ |  | 20,911 | ​
Tax expense | ​ |  | 710 | ​ |  | 799 | ​ |  | 2,875 | ​ |  | 6,630 | ​
Net change in unrealized gain (loss) on derivatives, net of reclassification adjustments and tax | ​ |  | 1,545 | ​ |  | (2,195) | ​ |  | 6,263 | ​ |  | 14,281 | ​
Other comprehensive (loss) income, net of tax | ​ | $ | (20,570) | ​ | $ | 4,045 | ​ | $ | (63,769) | ​ | $ | 10,500 | ​

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